txnbuild: add ToTransactionParams to Transaction

txnbuild/transaction.go

@@ -270,6 +270,20 @@ func (t *Transaction) HashHex(network string) (string, error) {
 	return hashHex(t.envelope, network)
 }
 
+// Generates TransactionParams from a Transaction. ToTransactionParams() sets
+// IncrementSequenceNum field to default in returned TransactionParams.
+func (t *Transaction) ToTransactionParams() TransactionParams {
+	srcAccount := t.SourceAccount()
+	tp := TransactionParams{
+		Memo:          t.Memo(),
+		Operations:    t.Operations(),
+		BaseFee:       t.BaseFee(),
+		SourceAccount: &srcAccount,
+		Preconditions: t.preconditions,
+	}
+	return tp
+}
+
 func (t *Transaction) clone(signatures []xdr.DecoratedSignature) *Transaction {
 	newTx := new(Transaction)
 	*newTx = *t

txnbuild/transaction_test.go

@@ -5089,3 +5089,24 @@ func TestGenericTransaction_HashHex(t *testing.T) {
 	require.NoError(t, err)
 	assert.Equal(t, expected, hashHex)
 }
+
+func TestTransToTransParamConvert(t *testing.T) {
+	kp0 := newKeypair0()
+
+	transParam := TransactionParams{
+		SourceAccount: &SimpleAccount{AccountID: kp0.Address(), Sequence: 1},
+		Operations:    []Operation{&BumpSequence{BumpTo: 0}},
+		BaseFee:       MinBaseFee,
+		Preconditions: Preconditions{
+			TimeBounds:                 NewTimeout(300),
+			LedgerBounds:               &LedgerBounds{0, 1},
+			MinSequenceNumber:          nil,
+			MinSequenceNumberAge:       10,
+			MinSequenceNumberLedgerGap: 2,
+		},
+	}
+	tx, err := NewTransaction(transParam)
+	assert.NoError(t, err)
+	ConvertedTransParam := tx.ToTransactionParams()
+	assert.Equal(t, ConvertedTransParam, transParam)
+}